Example usage for java.util Random nextInt

Introduction

In this page you can find the example usage for java.util Random nextInt.

Prototype

public int nextInt(int bound)

Source Link

Document

Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.

Usage

From source file:com.sap.core.odata.testutil.helper.StringHelper.java

/**
 * Generates a string with given length containing random upper case characters ([A-Z]).
 * @param len length of the generated string
 * @return random upper case characters ([A-Z])
 *//*from  ww  w. j av  a  2s.  c  o  m*/
public static String generateData(final int len) {
    Random random = new Random();
    StringBuilder b = new StringBuilder(len);
    for (int j = 0; j < len; j++) {
        final char c = (char) ('A' + random.nextInt('Z' - 'A' + 1));
        b.append(c);
    }
    return b.toString();
}

From source file:Main.java

/**
 * get random color rgb value//  w w w. j ava2s.  c om
 * @return rgb color int
 */
public static int getRandomColor() {
    Random random = new Random();
    /*
     * Better limiting value.
     * if value is too small, it will appear lighter
     * if value is too large, it will appear darker
     */
    //limit within 50-199
    int red = random.nextInt(150) + 50;
    int green = random.nextInt(150) + 50;
    int blue = random.nextInt(150) + 50;
    //create a color int as per rgb and return
    return Color.rgb(red, green, blue);
}

From source file:Main.java

public static String generatePassword() {
    Random r[] = new Random[8];
    r[0] = new Random();
    r[1] = new Random();
    r[2] = new Random();
    r[3] = new Random();
    r[4] = new Random();
    r[5] = new Random();
    r[6] = new Random();
    r[7] = new Random();
    Random x = new Random();
    StringBuilder password = new StringBuilder();
    int length = 6;
    password.setLength(length);//from  ww w .  j a v  a  2 s.c  o m
    for (int i = 0; i < length; i++) {
        x.setSeed(r[i % 8].nextInt(500) * r[4].nextInt(900));
        password.setCharAt(i, (char) (r[x.nextInt(256) % 8].nextInt(95) + 32));
    }
    return password.toString();
}

From source file:com.microsoft.tfs.core.httpclient.methods.multipart.MultipartRequestEntity.java

/**
 * Generates a random multipart boundary string.
 *
 * @return/*w  w w  .j a  va  2  s . co m*/
 */
private static byte[] generateMultipartBoundary() {
    final Random rand = new Random();
    final byte[] bytes = new byte[rand.nextInt(11) + 30]; // a random size
                                                          // from 30
                                                          // to 40
    for (int i = 0; i < bytes.length; i++) {
        bytes[i] = MULTIPART_CHARS[rand.nextInt(MULTIPART_CHARS.length)];
    }
    return bytes;
}

From source file:eu.falcon.fusion.TestTimeSeries.java

public static int randInt(int min, int max) {
    // Usually this can be a field rather than a method variable
    Random rand = new Random();
    // nextInt is normally exclusive of the top value,
    // so add 1 to make it inclusive
    int randomNum = rand.nextInt((max - min) + 1) + min;
    return randomNum;
}

From source file:com.android.internal.http.multipart.MultipartEntity.java

/**
 * Generates a random multipart boundary string.
*//*w w  w .j  av a  2 s .c o m*/
private static byte[] generateMultipartBoundary() {
    Random rand = new Random();
    byte[] bytes = new byte[rand.nextInt(11) + 30]; // a random size from 30 to 40
    for (int i = 0; i < bytes.length; i++) {
        bytes[i] = MULTIPART_CHARS[rand.nextInt(MULTIPART_CHARS.length)];
    }
    return bytes;
}

From source file:com.linkedin.paldb.impl.GenerateTestData.java

public static Integer[] generateRandomIntKeys(int count, int range, long seed) {
    Random random = new Random(seed);
    Set<Integer> set = new HashSet<Integer>(count);
    while (set.size() < count) {
        set.add(random.nextInt(range));
    }//from   w  ww. j a v a2 s.co m
    return set.toArray(new Integer[0]);
}

From source file:it.cnr.isti.smartfed.test.DatacenterFacilities.java

public static List<FederationDatacenter> getUniformDistribution(int numOfDatacenters, int numOfHost,
        FederationDatacenterProfile profile) {
    Random r = new Random(13213);
    int core_variance = maxNumOfCores - minNumOfCores;
    int delta_cores = core_variance > 0 ? r.nextInt(core_variance) : 0;

    if (numOfHost < 1)
        numOfHost = 1;//from w  ww.  j ava 2  s. co m

    List<FederationDatacenter> list = new ArrayList<FederationDatacenter>();

    for (int i = 0; i < numOfDatacenters; i++) {
        // create the virtual processor (PE)
        List<Pe> peList = new ArrayList<Pe>();
        int mips = 25000;
        for (int j = 0; j < minNumOfCores + delta_cores; j++) {
            peList.add(new Pe(j, new PeProvisionerSimple(mips)));
        }

        // create the hosts
        List<Host> hostList = new ArrayList<Host>();
        HostProfile prof = HostProfile.getDefault();
        prof.set(HostParams.RAM_AMOUNT_MB, 16 * 1024 + "");

        for (int k = 0; k < numOfHost; k++) {
            hostList.add(HostFactory.get(prof, peList));
        }

        // create the storage
        List<Storage> storageList = new ArrayList<Storage>(); // if empty, no SAN attached

        // create the datacenters
        list.add(FederationDatacenterFactory.get(profile, hostList, storageList));
    }
    return list;
}

From source file:com.hisrv.lib.multipart.MultipartEntity.java

/**
 * Generates a random multipart boundary string.
 *///from   www  .j a v  a 2 s .  c om
private static byte[] generateMultipartBoundary() {
    Random rand = new Random();
    byte[] bytes = new byte[rand.nextInt(11) + 30]; // a random size from 30
    // to 40
    for (int i = 0; i < bytes.length; i++) {
        bytes[i] = MULTIPART_CHARS[rand.nextInt(MULTIPART_CHARS.length)];
    }
    return bytes;
}

From source file:com.cognifide.actions.msg.replication.ReplicationMessageProducer.java

private static String generateRandomPathPart(String randomPath) {
    final StringBuilder builder = new StringBuilder();
    final Random random = new Random();
    for (char c : randomPath.toCharArray()) {
        if (c == '*') {
            builder.append(Integer.toHexString(random.nextInt(16)));
        } else {//from  ww  w. j  av a  2s .  c  om
            builder.append(c);
        }
    }
    return builder.toString();
}